DE202009011830U1 - Electrical connection terminal - Google Patents

Abstract

Connecting terminal (1) for the electrical connection of at least four electrical conductors (11), comprising
- At least two spring retainers (4) and
A connecting web (2) which electrically connects the spring receivers (4),
- wherein the spring receivers (4) have at least two substantially parallel side walls (5),
- wherein the spring receivers (4) each receive a spring (3) which is compressed by the side walls (5) of the spring receptacles (4), so that an electrical conductor (11) along a side wall (5) in the spring receptacle (4) between one end (9) of the spring (3) and the side wall (5) is insertable,
- Wherein the spring ends (9) are designed as Zugsicherungskante.

Description

THE iNVENTION field

The The invention relates to an electrical spring clip for contacting of at least four electrical conductors. The spring clamp points to at least two spring shots on, the side walls each compress an inserted spring, so that a to be contacted electrical conductor along a side wall in the spring receiver between the spring end and side wall can be inserted.

Background of the invention

electrical Spring clips in which a spring edged in a spring retainer sitting and the latter compresses the spring are out of the state of Technique known.

For example, the shows US 2,988,726 an enclosed in a pot and held by an adjustable screw spring. Electrical conductors to be contacted are inserted between a bent portion of the spring and the outer wall of the pot and clamped by the spring pressure thus amplified.

Summary of the invention

According to the invention a connection terminal for the electrical connection of at least four electrical conductors provided, the at least two spring retainers and a spring webs electrically connecting connecting web comprises. The spring mounts have two substantially parallel side walls on and take each a spring, which through the side walls of the Spring recordings is compressed. This is an electrical Conductor along a side wall in the spring receiver between a End of the spring and the side wall insertable. The spring ends are designed as a train protection edge.

The allows connection terminal according to the invention so a relatively easy installation and a secure hold of contacted electrical conductors. Besides, it is easy to open the springs for releasing contacted electrical conductors possible.

general description

Before a concrete embodiment of the connection terminal based the figures will be described in detail, first preceded by some general considerations.

spring clips unlike screw terminals usually allow a fairly simple insertion of the electrical to be contacted Ladder and therefore allow a comfortable and quick installation. For plug spring terminals, d. H. Spring clips for insertion of ladders without further aids, however, is the clamping force due to the limited spring force of the springs for one tool-free assembly regularly limited. For good properties of the electrical contact between to be connected However, electrical conductors and the terminal is sufficient Clamping pressure necessary. At higher spring force is however (depending on the nature of the conductor wires) for opening the springs for inserting the ladder usually the use again an auxiliary tool needed (which, however, regularly still less expensive than connecting one Screw terminal is). The tensioning of springs by means of auxiliary tools again needs space at the terminal. In this field of tension the various competing influencing factors (clamping pressure, simple and quick installation, space requirements) suggests the present Invention an improved solution.

The inventive connection terminal is as a Spring clamp for the electrical contacting of at least designed four electrical conductors. She has at least this two spring mounts on each other through a connecting bridge are electrically connected. Each spring seat can accommodate the contacting of at least two conductors. The connecting bridge is non-springy and made of an electrically conductive material such as For example, copper is manufactured and provides the electrical connection between the conductors to be connected.

Characteristic of the connection terminal is the structure of the spring retainers. These each have two (non-resilient) outer walls, in contrast to those in the US 2,988,726 basically run parallel to each other shown clamps. A strict parallelism in the sense that the side walls over their full height and depth are parallel to each other, is not required (ie they may, for example, in sections, for example, at their longitudinal ends, each bent outwards so that they are not parallel in these sections to each other). However, the side walls of a spring receiver are at least partially in each case parallel to each other.

The spring housings each accommodate a spring for clamping the ladder. The spring is compressed from both sides by the outer walls of the spring receptacle, so that prevails between the spring and the respective outer wall, a clamping pressure. This principle of compressed by a collar clamping spring is fundamentally different from other spring terminals, where the clamping pressure required for clamping solely by the spring force of a not captured clamping spring is generated (see, for example DE 2553558 , In which the spring force of these non-enclosed clamping springs can be additionally reinforced by further adjusting elements, see for example US 2,437,339 ).

present thus arise through the two-sided enclosure of the spring the outer walls of the spring holder two each Clamping points, so that at least one conductor in each case in a nip can be contacted. The spring receiver is designed in this way that an insertion to conductor to be contacted in each case along a side wall of the spring holder is possible. The side walls So serve in addition to the border of the spring and the leadership of the to be contacted. Due to the above parallelism The ladder also provides for two in a spring seat introduced to be contacted conductor substantially parallel to each other can be.

When in the US 2,988,726 disclosed spring clip assembly, the spring enclosed in the pot is bent around to the bottom of the pot. The clamping points between the spring and outer wall are thus in a bent part of the spring area. In contrast, in the connection clamp according to the invention, the clamping points are each formed by one end of the springs and a side wall of the spring receptacles. The spring ends in this case have an edge, which acts as a train protection and rests in the state without inserted conductor on the inside of the respective side wall. As a result, trapped conductors against (violent) pulling or other unintentional loosening secured. The train protection function is based on the principle of self-locking by digging the angularly configured spring ends by the pressure prevailing between the spring end and outer wall clamping pressure (at least slightly) in the surface of the clamped conductor. In addition, the angle between the inserted conductor and the compressed spring is less than 90 °, so that pulling out of the conductor without strain relief of the spring is prevented without destruction or damage to the conductor or the spring. The self-locking function can also be reinforced by a (re) hook-shaped design of the spring end. The self-locking can be canceled for the release of a conductor by strain relief of the spring by means of an auxiliary tool.

moreover It is possible that the side walls next to the already mentioned functions as electrical Serve contact surface by (or part of) them formed by the connecting web between the two spring receivers or - provided they are separated from the connecting bridge Functional units understood - from electrically good conductive Material manufactured and electrically connected to the connecting bar are. As an electrical conductor in the clamped state at least on a portion of the outer wall is applied, thereby a sufficiently large contact surface and thus good contact properties of the electrical contact ensured. But equally well are other arrangements of the connecting spring conceivable, in which the connecting web approximately in an area the spring receptacles, for example, the bottom, inner or central area extends, and the conductor there contact the connecting web.

at an optional embodiment of the connection terminal is the spring force after insertion and pinching of the electrical conductors no longer adjustable. The connection terminal thus has no adjusting devices, for example, for an increase in the spring force the springs on after insertion of the ladder. Rather, the necessary for a secure clamping of the electrical conductors spring force solely by the surround and compression of the springs by the Outer walls of the spring retainer (and possibly the inserted Ladder). As a result, a quick installation (an adjustment or adjustment of the clamping pressure is not necessary) reached. The However, said embodiment can be devices for a fundamental variation of the spring force before insertion have ladders, such as a step adjustment, so that the springs in the manufacture or pre-assembly of the connection terminal can be used in different positions in the spring receiver is.

In a special optional embodiment, the springs of the connection terminal arranged in the spring receptacles unadjustable with respect to the spring force. Accordingly, the connection terminal has no actuator or other Arrangement on, with which the spring force of the springs, both in Framework of manufacture or pre-assembly of the connection terminal itself as well as in the course of the connection of electrical conductors in the later Use of the clamp, is changed (a variation of Spring force can still be achieved by choosing different types of Springs may be possible). The connection terminal is characterized hereby by a simple structure with only a few, relatively simple Components from.

Another optional embodiment of the connection clamp relates to the shape of the spring receptacles. These can on the one hand cup-shaped, ie with an interior z. B. in the form of a cuboid with approximately square base and, for example, rounded corners (and thus rounded longitudinal edges of the interior), be designed. Also possible is a more slit-like shape. In this case, the interior of the spring is similar rather a square with a narrow rectangle as a base (here also the corners and thus the longitudinal edges may be rounded, also the shape over the entire height, width and depth of the spring retainer need not be uniform). In general, the shape of the spring receptacle is adapted to the shape of the springs, the latter (and thus also the shape of the spring receptacle) again being aligned with the type of electrical conductors to be connected (eg their cross sections, structure and strength of the wire material, etc.) , Preferably, the side walls of the spring retainers, along which conductors are to be inserted into them, at least in a certain section, a plane on which the conductor then up in clamping position or can rest. The shape of the front and rear walls may be arbitrary (eg flat or curved inwards or outwards).

at an optional further education are the (into the spring admission inserted) springs formed symmetrically in the longitudinal direction. Again, various shapes are possible. For example, you can the springs - based on a cross section through the longitudinal axis - in have the shape of a roof, a swingarm or a bow. at a roof shape, the spring has two straight outside areas and a central area with a bend on. With a swingarm or a bow, the outside areas are bent. While a swinging form also has a bend in the central region (The swingarm thus includes two partial arcs), this is missing in a bow shape (the spring has only one continuous Bow open). In all these embodiments of the springs, however, lie the edge-shaped ends of the roof angle, the swing arches or the one bow for the purpose of Zugsicherung on the inside the side wall or - used in the state ladder - on the vein surface.

at Another optional embodiment includes the spring receptacles one spring holder each. So the springs are not each only plugged into the interior of the spring retainer (and there held in compression by the sidewalls), but are in addition to the enclosure through the side walls locked by a fastener. The shape of the spring and the fastening device are coordinated.

The Spring holder is outside in some training the cup or slot-shaped interior of the spring receiver arranged. For example, it may be above or below the cup or slot provided. The spring sticks out in these cases So only with their respective outer areas in the interior inside while in its middle section is outside. This will be the opportunity allows easier access to the spring from outside, for example, for opening the spring with a Auxiliary tool for the purpose of inserting or loosening a electrical conductor (details below).

A optional design of the connection terminal has a center arranged between the side walls of the spring receiver Spring holder on. As already stated, the spring holder also outside the interior of the spring seat. Also in this case, the spring position is in the aforementioned embodiment in the middle between the two imaginary extensions the side walls. In the versions of the connection terminal with symmetrical spring this symmetrical arrangement leads the spring holder to the fact that the two clamping points of a spring receiver basically have the same clamping pressure and so on for the connection of similar conductors, in particular conductors same cross-section, are suitable. Shall the spring shots for the connection of different conductors, in particular conductors different cross-section, be tailored, so can this useful different clamping pressure of both terminal points an asymmetric design of the spring and / or asymmetric arrangement the spring holder (relative to the side walls) reached become.

at various embodiments of the connection terminal is provided to tension the spring with the aid of an auxiliary tool, d. H. For to open the insertion or loosening of electrical conductors. As an auxiliary tool comes, for example, a commercial Screwdriver or any other suitable tool in question. Spring mounts are preferably designed so that the auxiliary tool approximately from the direction of the conductor to be inserted or used, for example, parallel to the longitudinal direction of the ladder, in the recording is insertable, so that by pressing down an outer region of a spring the respective spring end releases from the surface of the side wall or the inserted conductor dissolves. It must with the auxiliary tool only on the spring itself, but not on other components the connection terminal are acted upon. It can be provided that the springs for clamping by the auxiliary tool are further formed, for example by a kind of notch, in which can be placed with the auxiliary tool (the above Roof, swing and bow shapes then have a corresponding such notch in the outdoor areas). Through the access from (approximately) the ladder longitudinal direction is a space-saving Use of the connection terminal possible.

For the (non-destructive) release of a clamped conductor is due to the zugsichernden Self-locking of the springs of the described use of an auxiliary tool usually necessary. Whether this also applies to the insertion of conductors, depends on the spring force and the nature of each conductor. In some embodiments of the connection terminal, the spring force is sized so large that the springs must be opened with not yet inserted conductor for the insertion of a conductor with the auxiliary tool. The large spring force allows an even better and safer electrical connection. However, an additional step is necessary in this case for the assembly of the ladder.

at other designs, however, the spring force is dimensioned so that solid ladder used without the use of an auxiliary tool can be. The spring force is thus slightly lower so that the spring in the course of inserting such a fixed Wire conductor through the conductor itself opens. Softer ladder, z. B. stranded, twisted stranded conductors, provide these embodiments but still too little material resistance, so that the pressure created during insertion of these conductors on the clamping spring does not overcome their spring force. For the Connection of such soft multi-wire conductor (which regularly is made using ferrules) therefore clamped the clamping spring with the auxiliary tool.

According to one In another embodiment, the connection terminal also has a terminal housing made of insulating material, allowing a safer use of the Clamp is guaranteed. For the connection of the electrical conductor and the access of the auxiliary tool to the springs points the terminal box to the appropriate access points Exception to.

Brief description of the pictures

One Embodiment of the connection terminal is based on the following drawings described. It shows:

1 a schematic, three-dimensional representation of the electrical connection terminal with (semi-open) terminal housing,

2 a side view of the electrical connection terminal,

3 the side view as in 2 in the course of connecting an electrical conductor with a not yet introduced auxiliary tool,

4 the connection terminal of 3 with the spring exciting auxiliary tool and tensioned spring,

5 the connection terminal of 4 with an electrical conductor to be inserted,

6 the connection terminal of 5 with the inserted conductor,

7 the connection terminal of 6 with removed auxiliary tool and again closed spring,

8th the connection terminal of 7 with the inserted conductor,

9 the connection terminal in a partial sectional view with two inserted electrical conductors in a spring receiver,

10 a schematic, three-dimensional representation of the electrical connection terminal of 9 .

11 the connection terminal in the course of contacting an electrical conductor without the aid of an auxiliary tool,

12 the connection terminal of 12 with the inserted conductor.

Detailed description the embodiments

The embodiment of the connecting terminal shown in FIGS 1 has two spring receptacles 4 and an electrically connecting connecting web 2 made of copper. It is of a terminal housing made of plastic, z. As PVC, surrounded (that in 1 is shown in a sectional view).

The two spring shots 4 Among other things, by "foothills" of the connecting bridge 2 educated. The latter extends over the entire width of both spring receptacles 4 and thus simultaneously forms their respective front walls. Both side walls 5 (please refer 1 and 2 ) are also made of electrically good conductive material (eg, turn copper) and electrically connected to the connecting web, namely with the front walls of the spring retainers 4 forming parts of the connecting web connected. Through this enclosure from three sides and that the connecting spring 1 surrounding terminal housing 10 creates an elongated, slit-like shape of the spring shots 4 (see eg 10 ) with longer front and rear walls and narrower side walls 5 ,

Each of the two spring shots 4 accommodates an elongated clamping spring fitted in the slot 3 , In the embodiment shown, this is symmetrical (with respect to the central axis in the transverse direction) (see 2 that the Symmetry in the state without inserted conductors 11 shows). The feathers 3 are saddle roof shaped; they each have two straight outside areas 8th (the "roof slopes") and a central area 7 (the "ridge of the roof"). The middle area 7 has an arcuate shape, leaving the springs 3 each with a spring holder 6 in the spring shots 4 be arrested. The spring mounts 6 are in the middle between the two side walls 5 in the spring shots 4 but outside over the slot of the spring retainers 4 arranged. In the empty state without inserted ladder, the springs are thus of the spring mounts 4 enclosed and compressed, ie the outside areas are through the side walls 5 pressed down, causing the spring ends 9 at the points of contact against the side walls 5 to press. Due to the symmetry of the spring 3 and its central arrangement in the spring receiver 4 is the clamping pressure at both spring ends 9 the same. Thus, the embodiment shown is good for the connection of conductors 11 same cross section suitable. Other conceivable embodiments, for the contacting of conductors 11 are designed different cross sections have asymmetrical springs 3 (ie spring wing 8th different length) and / or an asymmetric suspension of the spring 3 in the spring receptacle 4 on.

In every spring recording 4 can through this structure with the connection terminal 1 to be contacted electrical conductors 11 from the top along the side walls 5 be inserted. The clamp housing 10 has corresponding openings 13 for inserting the ladder 11 on. It is envisaged that in each case an electrical conductor 11 between the inside of each outer wall 5 and the spring ends 9 is positioned so that with the connection terminal 1 four conductors 11 can be contacted (alternatively, it is also conceivable, several conductors 11 to be used side by side in a nip; the spring receiver 4 then has a correspondingly greater depth and, for example, no longer has a slit but cup-like shape). The outer walls 5 serve both as a guide and as a sufficiently large contact surface for the production of a good electrical contact. Due to the presence of the ladder 11 become the feathers 3 additionally compressed. An insertion of the ladder 11 Can with or without the help of a spreading tool 12 happen (see below for details). The side walls 5 the spring recordings 4 are, except for their upper ends, which are slightly bent outwards (see, for example. 2 ) parallel to each other so that two in one spring receptacles 4 used ladder 11 parallel to each other. The two spring shots 4 On the other hand, in the example shown, they are not aligned parallel to each other but at an acute angle to one another. As a result, two pairs of conductors running in slightly different outgoing directions can be connected well. Alternatively it can be provided that the two spring receptacles 4 are arranged parallel to each other or at a larger angle.

The spring ends 9 are each as a clamping edge 9 educated. For an inserted electrical conductor 11 pinches the outside wall 5 oriented corner of the clamping edge 9 the leader 11 a (eg 8th ) and expresses itself due to the spring force of the spring 3 in the surface of the conductor 11 a (not shown in the figures). Thereby and by the angle <90 ° between conductors 11 and spring 3 becomes the appointed leader 11 against pulling out of the spring holder 4 tension-. If not a leader 11 is inserted, lies the clamping edge 9 with her towards the outer wall 5 oriented corner on this.

The feathers 3 are further adjustable with respect to the clamping pressure in the spring receptacles 4 accommodated. The connection terminal 1 Thus, it has no control elements o. Ä., With which the spring pressure varies in the context of the insertion of conductors, so for example, could be increased after insertion. The connection terminal 1 Thus, it comes with only a few simple components, with a secure terminals and easy insertion and detachment of conductors 11 still guaranteed.

The clamping pressure of the springs 3 Moreover, in the embodiment shown is also in principle, ie not in connection with the connection process of conductors 11 , unadjustable. However, embodiments can be provided in which such a basic adjustability is given, for example by the possibility of springs 3 as part of the manufacturing process or pre-assembly of the connection terminal 1 in a certain number of different positions in the spring mounts 4 or to be able to select from different types and sizes of springs. Likewise, embodiments of the connection terminal 1 conceivable in which different sizes of connecting webs 2 , z. B. with different distances of the side walls 5 the spring recordings 4 , before actually connecting the electrical conductors 11 can be used in the terminal housing.

The spring force of the compressed springs 3 is dimensioned in the described embodiment such that electrical conductors 11 made of relatively strong, solid wire without the aid of an auxiliary tool 12 in the dock clamp 1 can be used (see 11 and 12 ). For this purpose, the stripped conductor 11 simply through the recess 13 of the terminal housing towards spring receptacle 4 introduced. Due to the strength of the wire, the clamping edge 9 up and with her the pen 3 pressed down, leaving the conductor 11 the clamping edge 9 happens and, for example, as far as in the clamping spring 3 can be introduced that he is at least at the full height of the sidewall 5 is present ( 12 ). The above-mentioned pull-back protection against re-withdrawal is due to the acute angle between conductors 11 and spring 3 guaranteed. Of course, it is also possible with the said fixed wires, these with the assistance of an auxiliary tool 12 to use (to do so immediately). There are also other embodiments of the connection terminal 1 with higher spring force of the springs 3 (eg due to greater compression of the springs 3 by smaller distance between both outer walls 5 to each other) conceivable in which also ladder 11 of solid wire not without the help of an auxiliary tool 12 can be used.

Electric conductors 11 whose cores are made of flexible wires (eg twisted multiple strands), in contrast, in the described embodiment using an auxiliary tool 12 used (see in detail 3 to 8th ). The pressure that can be generated by inserting such flexible wires can be the spring pressure of the springs 3 do not overcome; Rather, it comes only to deformations of the wires. The insertion takes place with the aid of said auxiliary tool 12 for example, as follows:
First, the auxiliary tool 12 from above towards spring receptacle 4 introduced. The terminal housing has for this purpose separate openings 14 at a height on either side of the spring center area 7 on ( 1 ; It is also conceivable that for the introduction of ladders 11 and auxiliary tool 12 common recesses are provided). In the auxiliary tool 12 For example, it may be a commercially available screwdriver or, as in the 3 to 8th shown to act another wedge-like auxiliary tool with insulated handle. The insertion can be parallel to the (later) guidance of the conductor 11 take place and thus requires virtually no additional space in the vicinity of the connection terminal 1 (as opposed to inserting a tool from the side). The latter is therefore well suited for use in confined, confined space environments.

The auxiliary tool 12 hits the spring during insertion 3 where the opening 14 of the terminal housing 10 serves as a guide, allowing slipping due to the slope of the spring wing 8th is avoided. The insertion path until impact on the spring wing 8th is due to the suspension 6 the spring above the spring receiving slot 4 relatively short. By the one with the auxiliary tool 12 in the insertion direction exerted pressure is the spring wing 8th curious; excited ( 4 ). In the embodiment shown, the spring receivers 4 also another interior element 15 on which the maximum opening angle of the spring wing 8th limited. Is the spring 3 sufficiently open (preferably, the opening between clamping edge 9 and sidewall 5 at least the diameter of the stripped conductor to be used 11 can match), can now be the electrical conductor 3 through the recess 13 of the terminal housing (see also 10 ) in the area between side wall 5 and spring 3 be introduced ( 5 and 6 ).

Is the leader 3 brought into the desired contact position, the spring 3 for clamping the conductor 11 to be relaxed again. This is the auxiliary tool 12 simply withdrawing again from the spring wing 8th led away ( 7 ). The feather 3 is thus closed and presses the inserted conductor against the inner surface of the side wall 5 , The clamping edge 9 It is easily pressed into the surface of the ladder. With the subsequent removal of the auxiliary tool 12 from the terminal housing is the connection of the conductor 11 to the connection terminal 1 completed ( 8th ). Strictly speaking, the spring gives way 3 in this condition with only one conductor inserted 11 at least externally from the symmetry described above, since only one spring wing 8th curious, but the other is relaxed and (still) on the side wall 5 is applied. In the condition of two inserted conductors 11 with the same cross-section is the symmetry of the spring 3 also externally restored; both leaders 11 are with the same clamping pressure in the spring retainer 4 trapped ( 9 ).

It can then the other (up to three) ladder 11 be contacted in the same way. In the fully populated state (ie in the present example with four conductors used 11 ) are each two conductors 11 a spring retainer 4 then guided substantially parallel to each other.

Solving ladders 11 takes place in an analogous manner. As for the repeal of the self-locking principle, a strain relief of each spring 3 is necessary, the release happens regardless of the type of conductor 11 (fixed or flexible) always with the help of the auxiliary tool 12 ,

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - US 2988726 [0003, 0009, 0012]
• - DE 2553558 [0010]
• US 2,437,339 [0010]

Claims (15)

Connection terminal ( 1 ) for the electrical connection of at least four electrical conductors ( 11 ), comprising - at least two spring retainers ( 4 ) and - a connecting bridge ( 2 ), the spring recordings ( 4 ) electrically connected, - wherein the spring receptacles ( 4 ) at least two substantially parallel side walls ( 5 ), - wherein the spring receptacles ( 4 ) one spring each ( 3 ), which through the side walls ( 5 ) of the spring retainers ( 4 ) is compressed so that an electrical conductor ( 11 ) along a side wall ( 5 ) in the spring receptacle ( 4 ) between one end ( 9 ) the feather ( 3 ) and the side wall ( 5 ) is insertable, - wherein the spring ends ( 9 ) are formed as Zugsicherungskante. Connection terminal ( 1 ) according to claim 1, wherein the springs ( 3 ) with regard to the spring force after insertion of the electrical conductor ( 11 ) unadjustable in the spring receptacles ( 4 ) are arranged. Connection terminal ( 1 ) according to claim 1 or 2, wherein the springs ( 3 ) with regard to the spring force ( 11 ) unadjustable in the spring receptacles ( 4 ) are arranged. Connection terminal ( 1 ) according to one of the preceding claims, wherein the spring receptacles ( 4 ) are formed cup or slot-shaped. Connection terminal ( 1 ) according to one of the preceding claims, wherein the spring ( 3 ) is formed symmetrically in the longitudinal direction. Connection terminal ( 1 ) according to one of the preceding claims, wherein the springs ( 3 ) are roof-shaped, swing-shaped or arcuate. Connection terminal ( 1 ) according to one of the preceding claims, wherein the spring receptacles ( 4 ) each have a spring holder ( 6 ). Connection terminal ( 1 ) according to claim 7, wherein the spring attitude ( 6 ) is arranged outside of the cup or slot. Connection terminal ( 1 ) according to claim 7 or 8, wherein the spring attitude ( 6 ) in the middle between the side walls ( 5 ) of the spring receiver ( 4 ) is arranged. Connection terminal ( 1 ) according to one of the preceding claims, wherein the springs ( 3 ) for introducing and / or releasing electrical conductors ( 11 ) using an auxiliary tool ( 12 ) are tensionable. Connection terminal ( 1 ) according to claim 10, wherein the spring force of the springs ( 3 ) is so strong that when not yet inserted conductor ( 11 ) opening a clamping spring ( 2 ) only with the help of the auxiliary tool ( 12 ) is possible. Connection terminal ( 1 ) according to claims 1 to 10, wherein the conductors to be contacted ( 11 ) are formed as a solid wire and the spring force of the springs ( 3 ) is dimensioned such that, when the conductor is not yet inserted ( 11 ) by inserting the conductors ( 11 ) without the help of an auxiliary tool ( 12 ) can be opened. Connection terminal ( 1 ) according to claims 10 to 12, wherein the auxiliary tool ( 12 ) for tensioning the springs ( 3 ) substantially parallel to the guidance of the ladder ( 11 ) in the spring receptacle ( 4 ) is insertable. Connection terminal ( 1 ) according to one of the preceding claims, comprising a terminal housing ( 10 ) made of electrically insulating material. Connection terminal ( 1 ) according to claim 14, wherein the terminal housing ( 10 ) Recesses ( 13 . 14 ) for the insertion of electrical conductors ( 11 ) and the auxiliary tool ( 12 ) having.

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